Rabble.



OTTO SPINZIG AND WOLDEMAR HOMMEL, OF CLAUSTIIAL, GERMANY.

RABBLE.

Application filed March 28, 1914.

To all whom it may concern Be it known that we, OTTO SrINzIG and \VoLDnMAR HOMMEL, Ph. 1)., subject of the German Emperor and citizen of the Republie of Switzerland, respectively, residing at Clausthal, in the German Empire, have invented certain new and useful Improvements in Bubbles, of which the following is a specification.

This invention relates to a new or im- )lOVGCl process of and apparatus for treating ore or other materials in roasting and drying apparatus the term rabbling being employed herein to refer to the stirring of various materials besides ores or the like in various kinds of roasting or drying apparatus.

More particularly although not exclusively the invention is an improvement in or modification of the invention described in our application Serial No. 777,289 filed July 3, 1913.

In our said application is described a mechanical furnace with scraping device com-- prising one or more actuating rods arranged at right angles to the longitudinal axis of the oven and adapted to be moved to and fro in the interior of the same and carrying one or more rabble bars which extend in the longitudinal direction of the furnace and are provided with a series of \l-shaped or angled blades.

The object of the present invention is to provide a new or modified form of scrapers in such a manner that instead of shaping the individual scraper blades angularly and of arranging themin a single series simple flat iron blades are used which are arranged alternately in two rows on opposite sides of the axis of the rabble bar. The blades are staggered in the longitudinal direction of the furnace, the amount of such displacement being for instance equal to the longitudinal furnace space occupied by each blade.

The invention will now be described more fully with reference to the accompanying drawings, in which Figure 1 is a plan of a portion of a furnace with rabbles arranged according to the present invention; Fig. 2 is a cross section through one of the rabble bars carrying the blades; Fig. 3 shows another embodiment of a rabble bar with blades mounted thereon;

and Fig. 4: shows another embodiment of the individual blades.

Specification of Letters Patent.

Patented June 20, 1916.

Serial No. 827,962;

In the hearth a of the furnace in Fig. 1 are arranged perpendicularly to the longitudinal axis of the same the reciprocating rods 6 on which are mounted the rabble bars extending in the longitudinal direction of the furnace. On the under side of this bar are arranged the scraper blades or rabbles proper; (Z and e which are shown in the drawing in the dotted lines and consist of pieces of sheet iron. It will be seen that these blades or rabbles are arranged in two rows opposite each other in such way that the blades 6 are in a symmetrical relation to the blades (Z and that the successive blades in each row are staggered in the longitudinal direction of the hearth by a distance equal to the longitudinal space occupied by one blade. The mode of operation of such an arrangement is diagrammatically represented in Fig. 1 of the accompanying drawings and is as foll.ows:lf the rabble bar a mounted on the reciprocating rods 7) is moved to and fro in the furnace each individual scraper blade in its transit across the furnace passes through one zone of the hearth the blades (Z passing through the zones (Z (Z d, etc., respectively, and the blades 6 through the zones 0 e 0 etc. Assuming therefore that the rabble bar is moved 110w in the direction of the arrow 1, one cl blade, say the one located at the zone d, will displace the material to be roasted from its own zone, namely cl, into the zone 6. Vhen the scraper arm returns in the direction of the arrow 2 the adjacent 6 blade will displace said ore one remove farther, namely from the zone 6 into the zone d In this manner the material is gradually conveyed from zone to zone through the whole length of the furnace and is at the same time stirred up in a very advantageous manner. Instead of mounting all the blades on one common bar each one row of blades may, shown for instance in Fig. 3, be arranged on separate bars (1 and 0 These bars are advantageously secured to the reciprocating rods at both ends by means of cross pieces 9 provided with slots f which will allow their distance apart to be diminished or enlarged as required.

Fig. 4 shows a modified shape of blade. The same can of course be of angular shape or, better still, formed as three-cornered block pieces so that their horizontal section would appear as shown in Fig. 4. In this case their longest side is arranged parallel to the direction of movement of the rabble barand at the same time by this mode of construction the blades arestrengthened in themselves, and their rear face, that is the shortest of the three, will also help to convey forwardly the material to be roasted when the rabble bars are moved backward and forward. The way of mounting the scraper blades can be varied in numerous ways. They may for instance be cast with the bars or they may be mounted separately and individually on the same.

With these new arrangements of the scrapers very great advantages are attained. The intervals between the blades can be considerably larger with the herein described arrangement than heretofore; this is of great importance especially when roasting an ore which cakes easily in the furnace, because in such case comparatively large lumps which would otherwise be jammed between the blades can 'be conveyed forward without obstruction. A furtheradvantage of the new construction is that the ore is effectually prevented from accumulating at the sides or walls of the furnace.

As can be seen from Fig. 1' the blades of the 6 series do not convey the material right up to the side of the furnace, but the formation of the furrows, ceases at the line of the e scrapers themselves, and in the reverse movement the d scrapers return any ore that may have been moved over the e? line. The same'result is produced at the other side of the furnace, but in this case rthe relative functions of the two series of scrapers are reversed.

'lVhat we claim for our invention and desire to'secure by Letters Patent is 1. In a rabble adapted to be vreciprocated transversely of the furnace and with each forward and reverse movement to move the ore longitudinally of said furnace, a plurality of sets of scraper or stirrer blades mounted thereon at angles less than right angles to the intended line of movement of the rabble and in such manner that the blades of one set are pitched oppositely to those of the other set.

2. In a rabble adapted to be reciprocated transversely of the furnace and with each forward and reverse movement to move the ore longitudinally of said furnace, scraper or stirrer blades mounted angularly thereon in two rows but of opposite pitch and arranged alternately or staggered relatively to each other by the amount of space occupied by a blade so thatthe blades in one row lie opposite to and span the spaces between the blades in the other row.

In a rabble adapted to be reciprocated transversely of the furnace and with each forward and reverse movement to move the ore longitudinally of said furnace, the combination of a rabble bar, a set of scraper or stirrer blades arranged in a row and pitched at an angle less than a right angle to said bar, and another set of scraper or stirrer blades arranged in a row and pitched at an angle the reverse of the angle of the first mentioned row, the blades of one row lying opposite to and spanning the spaces in the other row, and means for moving the rabble bar perpendicularly to its length.

4. In a rabble adapted to be reciprocated transversely of the furnace and with each forward and reverse movement to move the ore longitudinally of said furnace, the combination of a plurality of rabble bars scraper or stirrer blades on one bar pitched at an angle thereto less than a right angle and scraper or stirrer blades on the other bar pitched at an angle the reverse of the first mentioned angle and situated opposite the spaces'between the other blades.

5. Ina rabble the combination of a plurality of rabble bars, scraper or stirrer blades on one bar pitched at an angle thereto less than a right angle and scraper or stirrer blades on' the other bar pitched at an angle the reverse of the first mentioned angle situated opposite the spaces between the other blades, slotted cross bars common to both said rabble bars for carrying them and means for engaging the slots in said cross bars for adjustably connecting said cross bars with the rabble bars.

6. In a rabble adapted to be reciprocated transversely of the furnace and with each forward and reverse movement to move the ore longitudinally of said furnace, a plurality of sets of scraper or stirrer blades mounted thereon at angles less than right angles to the intended line of movement of the rabble and in such manner that the blades of one set are pitched oppositely to those of the other set said blades being in the form of blocks of three cornered but not equilateral section.

In testimony whereof, we have allixed our signatures in presence of two witnesses.

OTTO SPINZIG. WOLDEMAR HOMMEL.

Copley otthh patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Wnhington; D. 0." 

